Friction-gear.



No. 758,323. vPAIEIIIBD APR. 26, 1904.

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l Y l: l b l z INVENTOR ATTORNEY PATENTED APR.. 26, 1904.

D.' L. LINDQUIST.. PRIGTION GEAR.

` APPLICATION FILED SEPT. 11, 1903.

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l UNITED STATES;

Patented April 26, 1904.

i PATENT OEEicE.

- DAVID LEONARDVLINDQUIST, or YoNxERs, NEW YORK.

` i Y FRlTloN-GEAR.

SPECIFICATION forming' part of Letters Patent No. 758,323, dated April26, 1904. Application nei september 1i, 1903.. seria No. 172,795. (Noman.)

To LZZ whom t may concern:

Be it known that I, DAVID LEONARD LIND- Qnisr, a subject of the King ofSweden and Norway, and a resident of Yonkers, Test-4 chester county, NewYork, have invented a new and useful Improvement in Friction- Gear, ofwhich the following is aspecification.

VThe invention relates .to a friction-gear applicable to the driving ofbelt-pulleys, hoisting apparatus, anda great variety of other purposes.

The, object of. the invention is to simplify friction-gear mechanism byreducing the num- V -ber of parts and by causing the frictional contactto occur between right cylindrical surfaces.

The invention consists 1n the various combinations and mechanisms moreparticularly' pointed out in the claims.

In the accompanying drawings, Figure 1 is Fig. 2 is a side elevationthereof, showing one of the rollers and the friction-track in section.Fig. 3 is a section on the line a. t of Fig. 2. Fig. t is a similar viewto Fig. 2, showing the frictiontrack and bed-plate in section. Fig. 5 isa horizontal section on the line Z) of Fig. 4. Fig. 6 is averticalsection on the line c @of Fig. 4. Fig. 7 represents a modification ofthe friction-gear, the friction-track being in section. Figs. 8, 9, 10illustrate the same modification combined with a further modification inthe spring-adjusting devices, Fig. 8 showing a horizontal section, Fig.9 avertical longitudinal section, and Fig. 1() a vertical transversesection on the line CZ Z of Fig. 9.

Similar numbers of reference indicate likel parts.

Referring first to the form of my apparatus shown in' Figs. 1 to 6,inclusive, 1 is the bedplate, and 2 the casing, of an electric motorsupported thereon. On the lower side of said casing is a lug 3, havingan opening the crosssection of( which is circular midway its length, asshown at 4, Fig. 5, and approximately elliptical at the ends, asrepresented at 5. The cylindrical pivot-pin 6 passes through saidopening and through openings in the bracket 7, secured on the bed 1. Byreason of this construction the motor may be tilted in a vertical planearound the pivot-pin as an axis and may also be turned in a horizontalplane, so faras the elliptical openings 5 will permit, around a verticalaxis passing. through the middle point 8 of said pin. It is thussupported on a universal joint. In the bed 1 is an adjustable screw-stop9, between which and the motor is interposed a helical spring 10. On theopposite side of the motor-pivot and projecting from the .bracket 7 isan arm 11, which carries an adjustable screw-stop 12. By adjusting thescrews 9 and 10 the inclination of the motor in either direction inavertical plane may be limited. Supported in arstandard 13 on thebed-plate is a shaft 25, carryingat one end the belt-pulley 14 and atthe other end the pulley 15, having a flange 16, the inner periphery ofwhich forms a friction-track for the two rollors 17 and18. Said rollersare journaled at the upper ends of arms 19 20, which at their lower endsare pivoted in lugs 21 22 on the bedplate. Between said rollers is apulley 23, fast on the motor-shaft 24. The motor-shaft 24: is not inline with the frictionpulley shaft 25, the center of the motor-shaftbeing above the center of the pulley-shaft, as shown in Fig. 3. Anydownward movement of the pulley 23 therefore tends to force saidv pulleybetween the rollers 17 18 and to set said rollers outwardly through theswinging of their supporting-arms 19 20, thus augmenting theirfrictional engagement with the inner periphery of the flange 16 onpulley 15. The position of the pivot-lug 3 is such that the motor haspreponderanceon the side at which the pulley 23 is located, so that saidpreponderance, tends in vthe manner described to wedge the pulley 23between the rollers 17 18. In order to make the contact between pulley23 and rollers 17 18 an elastic one to prevent jar, the helical spring10 is introduced between the motor-casing and the screw 9.' Through saidspring 10, also, by suitably adjusting the screw 9 the press ure of thepulley 23 on rollers 17 and 18 may be regulated. The enlargement `of theends 5 of the opening for the motor pivot-pin 6 permits the motor, asalready described, to turn on a .vertical axis passing through themiddle of the pin, and in this way the pulley 23 is Vfreeto adjustitself to any IOO irregularities in the frictional surfaces in contacttending to displace it in a horizontal plane. The length of the radiusof the arc over which said pulley movesis sufficiently great to make itspath in any direction for all practical purposes a straight line. Itwill be apparent that by this construction I avoid conical or inclinedfriction-surfaces and all devices for forcing the same together to takeup wear and utilize only right cylinders in contact. Furthermore, theirfrictional engagement is automatic, elastic, due chieiiy to gravity, andis secured through the supportingof the controlling member-the pulley24- on practically a universal joint, which permits it not only tomaintain a uniform and regulated contact, but to keep its position tothat end despite the effects of wear and other irregularities.

In the modification of my device shown in Figs. 7 to 10, inclusive, therollers 17 and 18 instead of being supported on swinging arms 19 2O arejournaled in horizontally-sliding bearings 26 27, arranged in a standard28, which is bolted to the bed-plate. The adjusting devices for pulley23 may be the same as shown in Fig. 2, or I may omit the screw 9 andspring 10 and, as shown in Figs. 7 8, 9, provide an enlargement ofmotor-shaft 24 between pulley 23 and its stufHng-box 29 to receive asleeve 30, which at its lower side is connected by a helical spring 31to an adjusting-screw 32, seated in standard 28. By suitably operatingthe screw 32 the elastic downward pressure of the pulley' 23 on therollers 17 and 18 may be regulated. A helical spring 33 is here alsointerposed between the bracketarm 11 and the motor.

In operation, the motor being in rotation, the pulley 23 frictionallyengages with the rollers 17 and 18 and these in turn with the track 16,thereby rotating said track,and hence the shaft 25 and belt-pulley 14.

I claim- 1. A rotary pulley, a universal-joint sup port therefor, amovable friction-track and friction-gears between and .in contact withsaid pulley and said track.

2. A rotary pulley, auniversal-joint support therefor, a movablefriction-track surrounding s aid pulley and friction-gears between andin contact with said pulley and said track.

3. Arotary pulley, auniversal-joint support therefor, a movablefriction-track, frictiongears between and in contact with said pulleyand said track, and means for regulating fric'- tional contact betweensaid' pulley and said gears.

4. A rotary pulley, a universal-joint support therefor, a movablefriction-track, frictiongears between and in contact with said pulleyand said track and means for causing elastic frictional contact betweensaid pulley and said gears.

5. Arotary pulley, a universal-jointsupport therefor, a rotatablefriction-track surrounding said pulley and friction-gears between and incontact with said pulley and said track.

6. A rotary pulley a universal-joint support therefor a rotatablefriction-track surrounding said pulley, friction-gears between and incontact withsaid pulley and said track and means for maintaining saidpulley in yielding frictional contact with saidgears.

7. A rotary pulley, a universal-joint support therefor, arotatablefriction-track surrounding said pulley and two movablefriction-rollers between and in contact with said pulley and said track;the said track being rotatable about an axis parallel to the prolongedaxis of rotation of said pulley.

8. A rotary pulley, auniversal-joint support therefor, a rotatablefriction-track surrounding said pulley and two movable friction-rollersbetween and in contact with said pulley and said track; the saidpulley-rollers and track having right cylindrical contact-surfaces andthe said track being rotatable about an axis parallel to the prolongedaxis of rotation of said pulley.

9. Two movable friction-rollers, arotatable friction-track surroundingand in contact with both, a pulley in frictional contact with saidrollers and a universally-swinging arm' supporting saidfpulleyl 10. Twomovable friction-rollers, a rotatable friction-track surrounding and incontact with both, a pulley in frictional contact with said rollers, auniversally-swinging arm sup- ..porting said pulley and means actingupon said arm for regulating the frictional contact of said pulley withsaid rollers.

11. 'lwo movable friction-rollers,a rotatable friction-track surroundingand in contact with both, a rotary pulley and a pivoted support l forsaid pulley; the said pulley being disposed in frictional contact withsaid rollers and the said support being movable on its pivot in avertical plane.

12. Iwo movable friction-rollers,a rotatable friction-track vsurroundingandrin contact with both, a rotary pulley and a movable supporttherefor; the said pulley resting by gravity above and in frictionalcontact with said rollers.

13. Two movable friction-rollers, a rotatable friction-track surroundingand in contact with both, a rotary pulley in contact with said rollers,a movable support for said pulley and means acting on said support foradjusting the frictional contact of said pulley and said rollers.

14. An electric motor, a pulley on the armatureshaft thereof, apivot-support for said motor, two movably-supported friction-rollers incontact with said pulley and a rotatable friction-track surrounding andin contact with said rollers.

15. An electric motor, a pulley on the armature-shaft thereof,apivot-support for said mo- IOO IIO

ISO

tor-the said motor preponderatng on the pulley side-two movablySupported frictionrollers in contact with said pulley and having theiraxes below the axis thereof anda rotatable friction-track surroundingand in Contact with said rollers.

16. An electric motor, a pulley on the armature-shaft thereof,apivot-support for said motor, means for adjusting the extent of movementof said motor on said pivot, two movably-supported friction-rollers incontact with said pulley, and a rotatable friction-track surrounding andin Contact with said rollers.

17. A rotatable circular friction-track, two movable friction-rollerssurrounded by said track, a rotary pulley in frictional contact withboth rollers, a movable support for said pulley and an adjustable springconnected to ers a movable support for said pulley and tWo 4 adjustablemutually-opposing springs connect'- ed to said pulley-support.

In testimony whereof I have signed my name to this specification in thepresence of two sub- 30 scribing witnesses.

DAVID LEONARD LIN'DQUIST.

W'itnesses:

HYATT L. 'GARRIsom I. A. VAN WART.

